Frequently Asked Questions
Search FAQs to quickly find the answer.
To calculate battery runtime:
1. Calculate capacity: Wh = V × Ah
2. Find device power consumption (W)
3. Runtime = Wh ÷ W
4. Actual runtime = Runtime × 0.9
1. Calculate capacity: Wh = V × Ah
2. Find device power consumption (W)
3. Runtime = Wh ÷ W
4. Actual runtime = Runtime × 0.9
To calculate charging time:
1. Check battery capacity (Ah)
2. Charger current (A)
3. Charging time = Ah ÷ A
4. Actual time = time × 0.8–0.9
1. Check battery capacity (Ah)
2. Charger current (A)
3. Charging time = Ah ÷ A
4. Actual time = time × 0.8–0.9
To calculate 3000mAh runtime:
Runtime = Ah ÷ A
Example: 3 ÷ 0.5 = 6 hours
With 90% efficiency: 5.4 hours
Runtime = Ah ÷ A
Example: 3 ÷ 0.5 = 6 hours
With 90% efficiency: 5.4 hours
100Ah → 10 hours (or 9 actual)
200Ah → 20 hours (or 18 actual)
300Ah → 30 hours (or 27 actual)
Formula: Ah ÷ A
200Ah → 20 hours (or 18 actual)
300Ah → 30 hours (or 27 actual)
Formula: Ah ÷ A
The time required to charge a 3.7V lithium battery depends on its capacity (mAh) and the charger current.
For example, a 1000mAh battery takes about 2 hours when charged at 0.5A.
A larger 2000mAh battery may require 3–4 hours with the same charger.
Using a proper lithium charger with overcharge protection is always recommended.
For example, a 1000mAh battery takes about 2 hours when charged at 0.5A.
A larger 2000mAh battery may require 3–4 hours with the same charger.
Using a proper lithium charger with overcharge protection is always recommended.
A 3.7V battery charging circuit is an electronic module that ensures safe charging of lithium cells.
It usually includes a power input (such as 5V USB), a charging controller chip like TP4056, resistors, capacitors, and a protected output connected to the battery.
Its purpose is to prevent overcharging, over-discharging, overheating, and to ensure efficient and safe charging.
It usually includes a power input (such as 5V USB), a charging controller chip like TP4056, resistors, capacitors, and a protected output connected to the battery.
Its purpose is to prevent overcharging, over-discharging, overheating, and to ensure efficient and safe charging.
A 3.7V lithium battery does not have a fixed amp rating.
The voltage is always 3.7V, but the capacity (mAh) varies depending on the cell size and type.
Some small cells may be 500mAh, while larger ones reach 2000mAh or more.
The capacity is usually printed on the battery label.
The voltage is always 3.7V, but the capacity (mAh) varies depending on the cell size and type.
Some small cells may be 500mAh, while larger ones reach 2000mAh or more.
The capacity is usually printed on the battery label.
The price of a 48V 200Ah lithium battery in Yemen ranges between $460 and $1400 depending on capacity and specifications.
A 48V 200Ah lithium battery produces approximately 9600Wh.
The duration depends on the load. For example, with a 1000W load the battery lasts around 9.6 hours.
The price of a 48V lithium battery varies by capacity: 200Ah ranges from $460–$1480, 300Ah from $2700–$2900, and 100Ah from $920–$950.